There's an article in The Guardian about the relationship between Richard I of England and Philip Augustus of France, and why they used to sleep together. It quotes my teacher (mentor, hero, personal inspiration) John Gillingham, who is still describing it pretty much the way he did when I was studying with him and he was writing his first biography of Richard.
I used to discuss this with Gillingham; his contention is that Richard and Philip were not lovers. I was more convinced he was right in the 1970s than I am now. Which is not to say I have any definitive evidence about Richard's sexuality that anyone else doesn't have, or Philip's either. It's more that I am less convinced now than I was then that 'straight' is a default setting for human beings of any station or in any century.
I am also... swayed in my judgement, fannishly speaking, on who I picture as playing Richard. Philip is no problem - he's in my head as Timothy Dalton or Jonathan Rhys Meyers, depending which movie you're thinking of, and gorgeous in either case. But neither filmed version of The Lion in Winter had a Richard that I particularly enjoyed or found sexy - no, it wasn't one of Anthony Hopkins' better roles, in my opinion - and I think fondly of the Ottawa Little Theatre production with Lawrence Aronovich as Richard and Alex Contreras as Philip. They were good. But the sexiest role in that production, surprisingly, was Jean-Claude Lizé as John.
Yeah... I like the James Goldman version.